some very useful information here for those who want to take driveway cleaning to the next level.

I learned my lesson on not rinsing oxalic after it performed it's magic. About two months after I did my own sidewalks, I noticed holes where some aggregate used to be. Turns out the aggregate is limestone. The acid caused the limestone to come loose and pop out. I'm thinking it actually dissolved the stone a little.

I learned my lesson on not rinsing oxalic after it performed it's magic. About two months after I did my own sidewalks, I noticed holes where some aggregate used to be. Turns out the aggregate is limestone. The acid caused the limestone to come loose and pop out. I'm thinking it actually dissolved the stone a little.

I've noticed this to I always rinse about 20 minutes after applying OX.